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The Largest Constructive Number: Graham's Number

May 29, 2015

Written byCuriosity Staff

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Graham's number (named after Ronald Graham) is the biggest number that's been used constructively. However, it is too big to even begin to think about. It is "a large number that is an upper bound on the solution to a certain problem in Ramsey theory." Graham's number is so big that it's impossible even to discuss the number of digits within it—as well as the number of digits within that number.